Hydrodynamics and Capture Efficiency of Plastic Cleanup Booms: Part I — Experiments and Dynamic Analysis

2017 ◽  
Author(s):  
Roberto Brambini ◽  
Bénédicte Dommergues ◽  
Hannah Maral ◽  
Bruno Sainte-Rose
Keyword(s):  
Dynamic Analysis ◽  
Global Economy ◽  
Vertical Plane ◽  
Cost Effective ◽  
Analysis Model ◽  
Plastic Pollution ◽  
Plastic Debris ◽  
Cfd Models ◽  
Core Technology ◽  
Effective Manner

To reduce the threatening consequences of plastic pollution on marine ecosystems and global economy, The Ocean Cleanup (TOC) Foundation develops technologies to extract, prevent, and intercept plastic debris from coastal and oceanic environments. The core technology being optimized is the use of floating booms placed perpendicular to the main ocean plastic flow so it can concentrate plastic debris to a point where it can be extracted, shipped and processed in a cost-effective manner. To better understand the behavior of such a system in the vertical plane and to calibrate dynamic analysis models as well as Computational Fluid Dynamics (CFD) models, TOC conducted model tests of a portion of the boom at 1:5 scale. These tests were carried out in the Concept Basin at the Maritime Research Institute of the Netherlands (MARIN). The aim of this paper is to present those tests along with the assessment of the dynamics of the boom and the validation of a dynamic analysis model to predict the mooring loads on the system.

Hydrodynamics and Capture Efficiency of Plastic Cleanup Booms: Part II — 2D Vertical Capture Efficiency and CFD Validation

2017 ◽  
Author(s):  
Bénédicte Dommergues ◽  
Roberto Brambini ◽  
René Mettler ◽  
Zaki Abiza ◽  
Bruno Sainte-Rose
Keyword(s):  
Global Economy ◽  
Cost Effective ◽  
Capture Efficiency ◽  
Cfd Model ◽  
Plastic Pollution ◽  
Cfd Validation ◽  
Plastic Debris ◽  
The Core ◽  
Core Technology ◽  
Effective Manner

To mitigate the growing impact of plastic pollution on marine ecosystems and global economy, The Ocean Cleanup (TOC) Foundation develops technologies to extract, prevent, and intercept plastic debris from coastal and oceanic environments. The core technology being optimized is the use of floating booms placed perpendicular to the main ocean plastic flow so it can concentrate plastic debris to a point where it can be extracted, shipped and processed in a cost-effective manner. To investigate the capture efficiency of such a system, TOC conducted model scaled tests at the Dutch research institute MARIN. The objective of this paper is to present those tests along with the assessment of an hydrodynamic model and a CFD model to predict the dynamics of a rigid boom on one hand and the validation of this CFD model to predict the capture efficiency of such a boom.

Multi-Scale Numerical Analysis of the Field Efficiency of an Ocean Plastic Cleanup Array

2016 ◽  
Author(s):  
Bruno Sainte-Rose ◽  
Laurent Lebreton ◽  
Joao de Lima Rego ◽  
Frank Kleissen ◽  
Julia Reisser
Keyword(s):  
Global Economy ◽  
Spatial Scales ◽  
Target Area ◽  
Japanese Island ◽  
Plastic Pollution ◽  
Plastic Debris ◽  
Multi Scale ◽  
Effective Manner ◽  
Field Efficiency ◽  
The Impact

The impact of plastic pollution on marine ecosystems and global economy has been drawing public concern since the end of the 20th century. To mitigate this issue, The Ocean Cleanup (TOC) Foundation is developing technologies to extract, prevent, and intercept plastic debris from coastal and oceanic environments. The core technology being optimized is the use of floating booms placed perpendicular to the main ocean plastic flow so it can concentrate plastic debris to a point where it can be extracted, shipped and processed in a cost-effective manner. In order to optimize the system’s field efficiency (i.e. mass of ocean plastic captured per length of floating boom), a multi-scale approach has been elaborated, where temporal and spatial scales span over several orders of magnitude. Here we introduce this general multi-scale method alongside its assumptions and multi-scale models. We then describe two application examples, the first corresponding to our coastal pilot in the Japanese island of Tsushima and the second related to our main cleanup target area: the so-called Great Pacific Garbage Patch, situated between Hawaii and the US west coast.

scholarly journals The Importance of Collaboration and Competition Within and Outside the OECD

2016 ◽  
Vol 11 (9) ◽  
pp. 13
Author(s):  
Ian Jackson ◽  
John McManus
Keyword(s):  
Global Economy ◽  
Cost Effective ◽  
World Market ◽  
Global Market ◽  
Conceptual Approach ◽  
Global Marketplace ◽  
Effective Manner ◽  
Challenges And Opportunities ◽  
National Governments

The purpose of this paper is to address the role of the OECD in the global marketplace. The paper highlights some current trends in the global market and the changing role of the OECD. In this context, the authors discuss various perspectives on the role of OECD in a globalized world. The authors focus on recent debates on the state of the global economy and the changing position of the OECD in the world market. The authors apply a conceptual approach combined with analyses of data and secondary material. The authors also put forward an argument for investigating what determines competition within and outside the OECD. In this context, creating markets within a global economy requires considerable stimulus on the part of national governments. This necessitates national governments working together in partnership with national and global firms to reduced bureaucracy and increase transparency to boost trade in a cost effective manner. This is seen by some economists to be a prerequisite to future competitiveness. Finally, the authors seek to demonstrate how leading countries within the OECD are building innovative capability to master the challenges and opportunities that the new emerging economies present (such as Brazil).

Challenge and Complexity of Virtual Team Management

2014 ◽  
pp. 109-120
Author(s):  
Edward T. Chen
Keyword(s):  
Competitive Advantage ◽  
Virtual Teams ◽  
Business Strategy ◽  
Global Economy ◽  
Business Processes ◽  
Low Cost ◽  
Cost Effective ◽  
Business Leaders ◽  
Talent Pool ◽  
Effective Manner

To thrive in our global economy, businesses must continually seek ways to maintain a competitive advantage by supplying the market with innovative and effective products and services. To do this, barriers of space and time must be overcome, conventional business processes must be enhanced, and customer demand must be promptly answered by high-quality, low-cost, or value-based products and services. One way for companies to meet these fast-paced market demands is by utilizing virtual teams. With virtual teams, companies can expand their talent pool beyond geographical barriers. Furthermore, they can incorporate a follow-the-sun process in their business strategy. Combined, this leveraged approach can better position companies to meet market demands in a more timely and cost-effective manner. However, to achieve this competitive advantage, business leaders must thoroughly understand the challenges associated with developing and managing virtual teams. This research chapter examines the reasons for utilizing virtual teams, challenges that stem from diversity, structural and behavioral characteristics, and managerial considerations for effective leadership, supporting technologies, best practices, and future implications.

scholarly journals Stakeholder Engagement in Cultural Organizations: An Explorative Study on Participatory Theatre

2016 ◽  
Vol 11 (9) ◽  
pp. 21
Author(s):  
Maria Cleofe Giorgino
Keyword(s):  
Stakeholder Engagement ◽  
Global Economy ◽  
Interdisciplinary Approach ◽  
Cost Effective ◽  
Cultural Participation ◽  
Cultural Organizations ◽  
Effective Manner ◽  
Challenges And Opportunities ◽  
Engagement Process ◽  
National Governments

This article explores the potentialities of the stakeholder engagement framework in the specific context of cultural organizations, underscoring the necessity to develop an interdisciplinary approach that combines the traditional managerial perspective with the contribution offered by other social disciplines, due to the peculiarities of the cultural mission pursued. Specifically, the article aims to investigate on the stakeholder engagement process to verify: a) how it may be adapted to consider the peculiarities of the cultural organizations and their activities; b) why cultural organizations should adopt the framework as here suggested referring to the cultural mission pursued. Combining the literature review with the analysis of a case study of participatory theatre, this article expects: a) to suggest a stakeholder engagement framework that may be specific for cultural organizations and their community; b) to verify its effectiveness in terms of both creation of cultural value and improvement of cultural participation. imes New Roman","serif";mso-ascii-theme-font:major-bidi; mso-fareast-font-family:宋体;mso-hansi-theme-font:major-bidi;mso-bidi-theme-font: major-bidi;mso-ansi-language:EN-US;mso-fareast-language:EN-GB;mso-bidi-language: AR-SA'>reating markets within a global economy requires considerable stimulus on the part of national governments. This necessitates national governments working together in partnership with national and global firms to reduced bureaucracy and increase transparency to boost trade in a cost effective manner. This is seen by some economists to be a prerequisite to future competitiveness. Finally, the authors seek to demonstrate how leading countries within the OECD are building innovative capability to master the challenges and opportunities that the new emerging economies present (such as Brazil).

Challenge and Complexity of Virtual Team Management

2014 ◽  
pp. 1107-1118
Author(s):  
Edward T. Chen
Keyword(s):  
Competitive Advantage ◽  
Virtual Teams ◽  
Business Strategy ◽  
Global Economy ◽  
Business Processes ◽  
Low Cost ◽  
Cost Effective ◽  
Business Leaders ◽  
Talent Pool ◽  
Effective Manner

To thrive in our global economy, businesses must continually seek ways to maintain a competitive advantage by supplying the market with innovative and effective products and services. To do this, barriers of space and time must be overcome, conventional business processes must be enhanced, and customer demand must be promptly answered by high-quality, low-cost, or value-based products and services. One way for companies to meet these fast-paced market demands is by utilizing virtual teams. With virtual teams, companies can expand their talent pool beyond geographical barriers. Furthermore, they can incorporate a follow-the-sun process in their business strategy. Combined, this leveraged approach can better position companies to meet market demands in a more timely and cost-effective manner. However, to achieve this competitive advantage, business leaders must thoroughly understand the challenges associated with developing and managing virtual teams. This research chapter examines the reasons for utilizing virtual teams, challenges that stem from diversity, structural and behavioral characteristics, and managerial considerations for effective leadership, supporting technologies, best practices, and future implications.

Strategic planning in grassland farming: Principles andapplications

1997 ◽  
pp. 191-197
Author(s):  
W.J. Parker ◽  
N.M. Shadbolt ◽  
D.I. Gray
Keyword(s):  
Strategic Planning ◽  
Performance Indicators ◽  
Cost Effective ◽  
Key Performance Indicators ◽  
Strategic Plans ◽  
Effective Manner ◽  
Farm Business ◽  
Pastoral Farming ◽  
Financial Environment

Three levels of planning can be distinguished in grassland farming: strategic, tactical and operational. The purpose of strategic planning is to achieve a sustainable long-term fit of the farm business with its physical, social and financial environment. In pastoral farming, this essentially means developing plans that maximise and best match pasture growth with animal demand, while generating sufficient income to maintain or enhance farm resources and improvements, and attain personal and financial goals. Strategic plans relate to the whole farm business and are focused on the means to achieve future needs. They should be routinely (at least annually) reviewed and monitored for effectiveness through key performance indicators (e.g., Economic Farm Surplus) that enable progress toward goals to be measured in a timely and cost-effective manner. Failure to link strategy with control is likely to result in unfulfilled plans. Keywords: management, performance

Dynamic Analysis of Cage Stress in Tapered Roller Bearings Using Component-Mode-Synthesis Method

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Tomoya Sakaguchi ◽  
Kazuyoshi Harada
Keyword(s):  
Rigid Body ◽  
Dynamic Analysis ◽  
Boundary Point ◽  
Axial Load ◽  
Synthesis Method ◽  
Load Condition ◽  
Component Mode Synthesis ◽  
Analysis Model ◽  
Tapered Roller ◽  
Tapered Roller Bearings

In order to investigate cage stress in tapered roller bearings, a dynamic analysis tool considering both the six degrees of freedom of motion of the rollers and cage and the elastic deformation of the cage was developed. Cage elastic deformation is equipped using a component-mode-synthesis (CMS) method. Contact forces on the elastically deforming surfaces of the cage pocket are calculated at all node points of finite-elements on it. The location and pattern of the boundary points required for the component-mode-synthesis method were examined by comparing cage stresses in a static condition of pocket forces and constraints calculated by using the finite-element and the CMS methods. These results indicated that one boundary point lying at the center on each bar is appropriate for the effective dynamic analysis model focusing on the cage stress, especially at the pocket corners of the cages, which are actually broken. A behavior measurement of a polyamide cage in a tapered roller bearing was conducted for validating the analysis model. It was confirmed in both the experiment and analysis that the cage whirled under a large axial load condition and the cage center oscillated in a small amplitude under a small axial load condition. In the analysis, the authors discussed the four models including elastic bodies having a normal eigenmode of 0, 8 or 22, and rigid-body. There were small differences among the cage center loci of the four models. These two cages having normal eigenmodes of 0 and rigid-body whirled with imperceptible fluctuations. At least approximately 8 normal eigenmodes of cages should be introduced to conduct a more accurate dynamic analysis although the effect of the number of normal eigenmodes on the stresses at the pocket corners was insignificant. From the above, it was concluded to be appropriate to introduce one boundary point lying at the center on each pocket bar of cages and approximately 8 normal eigenmodes to effectively introduce the cage elastic deformations into a dynamic analysis model.

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